Large Holocene morphogenic earthquakes along the Albox fault, Betic Cordillera, Spain

Masana, Eulàlia; Pallàs, Raimón; Perea, Héctor; Ortuño, María; Martínez‐Díaz, J. J.; García‐Meléndez, Eduardo; Santanach, P.

doi:10.1016/j.jog.2005.07.002

Cited by 41 publications

(42 citation statements)

References 21 publications

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“…2) in the eastern Huércal-Overa basin, identify at least two paleoearthquakes associated with the AMF during the last 150 ka and estimate a minimum vertical slip rate of ~0.02 mm/yr in the southern fault termination since the Middle Pleistocene (Ortuño et al, 2009). In addition, a palaeoseismologic study in El Ruchete sec-WRU )LJ LGHQWL¿HG IDXOW VHJPHQWV ZLWK VKRUWWHUP VOLS rates ranging from 0.01 to 0.4 mm/yr and two possible paleoearthquakes deposits associated with them (Masana et al, 2005). This reverse fault segment probably belongs to the horsetail reverse splay of the AMF (Fig.…”

Section: Miocene Tectonic Structuresmentioning

confidence: 97%

“…The central and eastern part of the Huércal-Overa basin is deformed by ENE-WSW trending reverse faults with a splay geometry, belonging to the southern end of the Alhama de Murcia left-lateral transcurrent fault (AMF) (Martínez-Díaz et al, this volume). These faults deform the Quaternary alluvial fan deposits in the eastern Huér-cal-Overa basin (Groupe de Recherche Néotectonique, 1977;Briend, 1981) and have been recently characterized with geomorphological, structural, and paleoseismologic studies (García-Meléndez et al, 2003;Soler et al, 2003;Masana et al, 2005;Meijninger and Vissers, 2006;Ortuño et al, 2009). Thus, paleoseismologic studies near Goñar (Fig.…”

Section: Miocene Tectonic Structuresmentioning

confidence: 99%

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Recent and active faults and folds in the central-eastern Internal Zones of the Betic Cordillera

Pedrera

Galindo-Zaldı́var

Marín‐Lechado

et al. 2012

Journal of Iberian Geology

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The most recent tectonic structures of the central-eastern Internal Zones of the Betic Cordillera (from 3.1ºW to 1.7ºW and to the south of 37.525ºN) include fault and folds developed from the Late Miocene onwards, which are related to N-S/NW-SE directed continental collision and moderate thickening of a crust that is relatively hot at depth. In this setting, E-W to WSW-ENE folds, with locally associated E-W transpressive right-lateral and reverse faults, favoured the emersion of the northern Alborán basin palaeomargin and the progressive intramontane basin disconnection. The NNE-SSW to NE-SW trending regional left-lateral Palomares and Carboneras fault zones are dominant structures in the easternmost part of the cordillera. In addition, NW-SE to WNW-ESE trending normal and oblique-slip normal faults are widespread. The collision is still active and continues to drive active folds and faults, some probably being the likely source of moderate-sized earthquakes. The Campo de Dalías and surrounding sectors, deformed by active ENE-WSW folds and NW-SE to WNW-ESE oblique-slip normal faults, are probably the sites with the largest FRQFHQWUDWLRQ RI VLJQL¿FDQW HDUWKTXDNHV GXULQJ UHFHQW \HDUV 0RGHUDWHPDJQLWXGH HDUWKTXDNHV 0Z WR KDYH RFFXUUHG WKHUH at fairly regular intervals, in 1804, 1910, and 1994. Toward the east, NW-SE trending normal faults extending from Almería to the Tabernas basin deform the Quaternary rocks with associated moderate seismicity (the 2002 Gergal Mw 4.7 earthquake, and possibly the 1894 Nacimiento earthquake, felt with intensity VII). In the Sorbas-Vera basin, the Palomares fault zone is also responsible for moderate-sized earthquakes (1518 Vera earthquake). In the Almanzora corridor, NW-SE to WNW-ESE trending Lúcar-Somontín faults also could be considered one of the possible source of moderate-magnitude seismicity (1932 Lúcar, Mw 4.8 earthquake felt ISSN (print): 1698-6180. ISSN (online): 1886

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Section: Miocene Tectonic Structuresmentioning

confidence: 97%

Section: Miocene Tectonic Structuresmentioning

confidence: 99%

Recent and active faults and folds in the central-eastern Internal Zones of the Betic Cordillera

Pedrera

Galindo-Zaldı́var

Marín‐Lechado

et al. 2012

Journal of Iberian Geology

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“…The AMF as a neotectonic structure is considered to end near Alcantarilla where its activity is transferred to the Carrascoy fault, located to the south parallel to the AMF (Martínez-Díaz, 2002;Insua-Arevalo et al, 2012). The southern end of the AMF is defined by the Goñar fault array (Ortuño, 2012) and farther west the deformation is transferred to the Albox fault (Masana et al, 2005).…”

Section: Alhama De Murciamentioning

confidence: 99%

Active tectonics of the Alhama de Murcia fault, Betic Cordillera, Spain

Martínez‐Díaz

Masana

Ortuño

2012

Journal of Iberian Geology

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We present an overview of the knowledge of the structure and the seismic behavior of the Alhama de Murcia Fault (AMF). We utilize a fault traces map created from a LIDAR DEM combined with the geodynamic setting, the analysis of the morphology, the distribution of seismicity, the geological information from E 1:50000 geological maps and the available paleoseismic data to describe the recent activity of the AMF. We discuss the importance of uncertainties regarding the structure and kinematics of the AMF applied to the interpretation and spatial correlation of the paleoseismic data. In particular, we discuss the nature of the faults dipping to the SE (antithetic to the main faults of the AMF) in several segments that have been studied in the previous paleoseismic works. A special chapter is dedicated to the analysis of the tectonic source of the Lorca 2011 earthquake that took place in between two large segments of the fault.Keywords: Alhama de Murcia Fault, Betic Cordillera, active faults, slow-moving faults, strike-slip faults. ResumenEn este estudio se presenta una revisión del conocimiento que hasta la actualidad se tiene de la estructura y comportamiento sismogenético de la Falla de Alhama de Murcia (AMF). Se utiliza un nuevo mapa de la traza de la AMF realizado a partir de un modelo -Díaz et al. / Journal of Iberian Geology 38 (1) 2012: 253-270 Martínez IntroductionThe Alhama de Murcia Fault (AMF) (Bousquet et al., 1979) is a strike-slip shear zone with reverse component that crosses the eastern Betic cordillera with a NE-SW direction ( Fig. 1). The AMF accommodates ~ 0.1 -0.6 mm/yr of the approximately 5 mm/yr of convergence between Nubian and Eurasian plates (Masana et al., 2004) and is one of the largest faults of the Eastern Betics Shear Zone (Silva et al., 1993). Many of the largest damaging historical earthquakes occurred in the eastern Betic Cordillera are related to this structure (Fig. 1).The most damaging earthquake occurred in Spain in the last 50 years took place next to the city of Lorca (11/05 2011, Mw 5.2). In spite of its moderate size this earthquake produced massive damage in this city. This earthquake has been related to the activity of the AMF (i. e. IGME, 2011;Vissers and Meijninger, 2011; LopezComino et al., 2012;. In recent years several studies have focused on the characterization of the paleoseismic activity and the determination of AMF seismic parameters: slip rate, recurrence interval, maximum magnitude Masana et al., 2004, 2005, Masana, 2010Ortuño et al., 2012). All of these parameters were obtained by the study of trenches excavated in sites that were appropriated to identify recent (preferably later Quaternary) surface ruptures. Until now, these studies have been restricted to two of the four segments that form the AMF. The correct interpretation of these data and the correct extrapolation to the whole fault requires a good knowledge of the deep and shallow structure of the fault zone. But this also requires improving our understanding of the relationships between th...

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“…In recent years, a continuous effort has been made to adapt the paleoseismological approach to the slow active faults of the southeastern Iberian margin that accommodate the convergence between the Iberian and African plates (e.g. Martínez-Diaz et al, 2001;Martínez-Díaz and Hernández-Enrile, 2004;Masana et al, 2004Masana et al, , 2005Gràcia et al, 2006Gràcia et al, , 2010Moreno et al, 2008). This approach, which also considers the offshore faults, is crucial for estimating realistic values of the seismic hazard in this area largely based on the relatively short period of instrumental (< 100 yr) and historical (< 2000 yr) earthquake catalogues for the Iberian Peninsula (e.g.…”

Section: Introductionmentioning

confidence: 99%

Acoustic and seismic imaging of the Adra Fault (NE Alboran Sea): in search of the source of the 1910 Adra earthquake

Gràcia

Bartolomé

Iacono

et al. 2012

Nat. Hazards Earth Syst. Sci.

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Abstract.Recently acquired swath-bathymetry data and high-resolution seismic reflection profiles offshore Adra (Almería, Spain) reveal the surficial expression of a NW-SE trending 20 km-long fault, which we termed the Adra Fault. Seismic imaging across the structure depicts a subvertical fault reaching the seafloor surface and slightly dipping to the NE showing an along-axis structural variability. Our new data suggest normal displacement of the uppermost units with probably a lateral component. Radiocarbon dating of a gravity core located in the area indicates that seafloor sediments are of Holocene age, suggesting present-day tectonic activity. The NE Alboran Sea area is characterized by significant low-magnitude earthquakes and by historical records of moderate magnitude, such as the M w = 6.1 1910 Adra Earthquake. The location, dimension and kinematics of the Adra Fault agree with the fault solution and magnitude of the 1910 Adra Earthquake, whose moment tensor analysis indicates normal-dextral motion. The fault seismic parameters indicate that the Adra Fault is a potential source of large magnitude (M w ≤ 6.5) earthquakes, which represents an unreported seismic hazard for the neighbouring coastal areas.

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Large Holocene morphogenic earthquakes along the Albox fault, Betic Cordillera, Spain

Cited by 41 publications

References 21 publications

Recent and active faults and folds in the central-eastern Internal Zones of the Betic Cordillera

Recent and active faults and folds in the central-eastern Internal Zones of the Betic Cordillera

Active tectonics of the Alhama de Murcia fault, Betic Cordillera, Spain

Acoustic and seismic imaging of the Adra Fault (NE Alboran Sea): in search of the source of the 1910 Adra earthquake

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